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Geoffrey Herzog

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3y ago

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Do mammals have gills, or do they rely on other respiratory organs for breathing?

Mammals do not have gills. They rely on other respiratory organs, such as lungs, for breathing.


explain why hormones in the bloodstream are able only to affect target cells/organs and not other cells/organs?

Hormones in the bloodstream are able to affect target cells/organs and not other cells/organs because of selective permeability. This means that hormones are only able to pass through the cell membrane of certain cells and organs, and not through the cell membrane of other cells and organs. The cell membrane of the target cells and organs are specialized to allow the hormones to pass through, while the cell membrane of other cells and organs are not specialized and are therefore impermeable to the hormones. This is due to the presence of receptor proteins on the cell membrane of the target cells and organs. These receptor proteins can bind to the hormones and facilitate their entry into the cell. Since these receptor proteins are not present on the cell membrane of other cells and organs, the hormones are unable to bind to them and therefore unable to cross the cell membrane. In addition, hormones can be broken down by enzymes in the bloodstream, which means they can’t reach their target cells and organs if they are exposed to the enzymes. This further ensures that hormones only affect the target cells and organs, and not other cells and organs. In summary, hormones in the bloodstream are able to affect target cells and organs and not other cells and organs because of selective permeability and the presence of receptor proteins on the cell membrane of the target cells and organs. Other cells and organs do not have these specialized receptor proteins and therefore cannot be affected by the hormones.


What is a boys organs?

"Boys have reproductive organs called testes, which produce sperm and the male hormone testosterone. They also have other internal and external organs like the penis, scrotum, and prostate gland."


Where do the internal organs of Ascaris attach to the body wall?

The digestive tract and reproductive organs of an Ascaris are free floating within the body and do not attach to the body wall. Ascaris do not have any other internal organs other than the gut and internal reproductive organs, as breathing and waste excretion are handled externally within the body wall.


What is a collection of vital organs in the chest?

The collection of vital organs in the chest is called the thoracic cavity. It includes the heart, lungs, and other important organs such as the esophagus and major blood vessels. These organs work together to support breathing and circulation.